VVF 3.4 Virus

Virus Name: VVF 3.4 Aliases: V Status: Rare Discovered: April, 1992 Symptoms: .COM & .EXE growth; decrease in total system & available free memory Origin: USSR Eff Length: 1,614 - 1,628 Bytes Type Code: PRhA - Parasitic Resident .COM & .EXE Infector Detection Method: ViruScan, F-Prot, Sweep, NAV, NAVDX, ChAV, AVTK, IBMAV, VAlert, PCScan, NShld, Sweep/N, Innoc, AVTK/N, LProt, NAV/N, IBMAV/N Removal Instructions: Delete infected files General Comments: The VVF 3.4 virus was submitted in April, 1992. It is reported to be from the USSR. VVF 3.4 is a memory resident infector of .COM and .EXE programs, but not COMMAND.COM. The first time a program infected with VVF 3.4 is executed, this virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. Total system and available free memory, as measured by the DOS CHKDSK program, will decrease by 3,488 bytes. Interrupt 12's return will not have been moved. Interrupts 1C and 21 will be hooked by VVF 3.4. Once VVF 3.4 is memory resident, it will infect .COM and .EXE programs when they are executed. Infected .COM programs will have a file length increase of 1,614 bytes with the virus being located at the beginning of the file. Infected .EXE programs will have a file length increase of 1,614 to 1,628 bytes with the virus being located at the end of the file. The file's date and time in the DOS disk directory listing will not be altered. One text string can be found within the viral code in VVF 3.4 infected programs: "VVF3.4" It is unknown what VVF 3.4 does besides replicate.